The main constituent of natural gas is: MCQ with Answer and Explanation

Question
The main constituent of natural gas is:
A. Propane
B. Methane
C. Butane
D. Ethane
Answer: Option B
Solution (By JKExamLibrary)
Natural gas is primarily methane (CH₄), typically 70-90%, along with small amounts of ethane, propane, butane, and other hydrocarbons. It is a fossil fuel formed from the remains of ancient marine organisms. CNG (compressed natural gas) is methane stored at high pressure. LPG (liquefied petroleum gas) mainly contains propane and butane. Methane has the highest calorific value among the given options per unit mass.
This question belongs to: Science chemistry
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Question #1
The process of heating coal in the absence of air to produce coal gas, coal tar, and coke is called:
A. Carbonization
B. Cracking
C. Fractional distillation
D. Destructive distillation
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Correct Answer: Option D

Explanation:
Destructive distillation is the process of heating a carbon-containing substance (like coal or wood) in the absence of air to break it down into various products. For coal, it yields coke, coal tar, coal gas, and coal dust. Fractional distillation is used for separating liquid mixtures like petroleum.
This question belongs to: Science chemistry
Question #2
Which gas will diffuse fastest under identical conditions?
A. CO₂
B. NH₃
C. N₂
D. O₂
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Correct Answer: Option B

Explanation:
Rate of diffusion is inversely proportional to the square root of molar mass (Graham's law). Lighter gases diffuse faster. Molar masses: NH₃ = 17, N₂ = 28, O₂ = 32, CO₂ = 44 g/mol. Therefore NH₃ has the lowest molar mass and diffuses fastest. This law also explains why the smell of perfume spreads quickly. NH₃ is lighter than air and would rise.
This question belongs to: Science chemistry
Question #3
Sulphuric acid is produced by Contact process. The raw materials are:
A. NH₃, air, water
B. CaCO₃, HCl
C. S or FeS₂, air, water
D. NaCl, H₂O
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Correct Answer: Option C

Explanation:
Contact process: Sulfur or pyrite (FeS₂) is burned in air to form SO₂, then SO₂ is oxidized with O₂ over V₂O₅ catalyst to SO₃, which is absorbed in concentrated H₂SO₄ to produce oleum, then diluted to get H₂SO₄. Raw materials: sulfur (or pyrite), air, and water (for dilution). Not NaCl or NH₃.
This question belongs to: Science chemistry
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